Revolving chair having resiliently-mounted seat



A. STOLL REVOLVING CHAIR HAVING RESILIENTLY MOUNTED SEAT Filed March 4, 1927 Patented Aug. 20, 1929.

UNITED STATES ALBERT STOLL, 0F KOBLENZ, SWITZERLAND.

REVOLVING CHAIR HAVING RESILIENTLY-MOUNTED SEAT.

Application filed March 4, 1927, Serial No. 172,858, and in Germany March 18, 1926.

The present invention has reference to arevolving stool or chair having a resiliently mounted seat and with which an adjustment of the height of the seat is effected by means of a stem adapted to be screwed in a sleeve or by notches and latches, the stem being supported 'by a spring. Known constructions in which the spring is arranged inside the guide sleeve present the disadvantage that the spring must have a greater height than the height by which the seat may be ad justed. The chair is thereby rendered unstable and the spring power is only utilized for the smallest part.

These disadvantages are overcome in the revolving chair according to the present invention which is characterized by the fact that the spring surrounds the sleeve and abuts with its one end against a flange on the sleeve and with its other end against a guide ring fixed to the pedestal. This construction of the chair permits to choose the spring independently of the height of adjustment of the seat and its spring power may be totally utilized, in as much as, for example, number of windings and diameter of the spring wire may be so determined that at a given maximum load the spring is totally compressed.

Two constructional examples of the subject matter of the present invention are illustrated on the accompanying drawings, in which:

Fig. 1 shows in elevation and partly in a vertical section a revolving chair with a resiliently mounted seat, which is adjustable in height by means of a screw-threaded spindle, and

Fig. 2 shows in elevation and partly 1n a vertical section a revolving chair with a resiliently mounted seat which is adjustable by means of a stem held in the adjusted position by notches and a locking member.

The pedestal (Fig. 1) consists of the feet 1 the upper ends of which are fixed in an upper guide ring 2 by means of screws. At a lower elevation the lower guide ring forms the connection of the feet with each other. In the guide ring 3 the guide sleeve 4 is mounted, the latter being provided with screw thread 5 and the spindle 6 carrying the seat cooperates with the screw thread 5 for adjusting the height of the seat. In order to prevent the guide sleeve 4 from turning when the spindle 6 is turned for adjusting the height of the seat a groove 7 is cut into the sleeve 4 and a set screw 8 screwed into the tubular socket of the lower guide ring 3 projects into said groove 7. The latter permits a displacement of the sleeve 4 in the axial direction. Between the flange 9 welded to the sleeve 4 and the lower guide ring 3 a compression spring 10 surrounding the sleeve 4 is inserted, which spring resiliently supports the seat on the pedestal.

With the revolving stool illustrated in Fig. 2 the guide sleeve 11 adapted to be vertically displaced in the lower guide ring 3 is provided with ears 12, in which a pin 13 is mounted serving as fulcrum for a latch lever 14. The latter is provided at its upper end with a nose 15 cooperating with the notches 17 of the stem 16, the nose 15 passing thereby through an opening 18 of the sleeve 11. The stem 16 may thus be displaced and locked in the sleeve 11 by disengaging the latch lever 14 and letting it snap into the respective notch after the stem has been displaced to the required height, The spring provided below the lever 14 urges the nose 15 into the respective notch 17 and holds it in engagement withv the latter. In order to prevent an angular displacement of the notches 17 relatively to the nose 15 a groove 20 is provided in the stem and a set screw 21 projects into said groove. As in the first constructional example the sleeve 11 is provided with a flange 28 welded thereto and between this flange 23 and the guide ring 8 a compression spring 22 surrounding the sleeve 11 is inserted by means of which the sleeve 11 and thereby the steni 16 and the seat are resiliently supported.

I claim:

1. A revolving chair, comprising in combination, a pedestal, a guide ring rigidly fixed to said pedestal, a seat, a" stem provided with notches and carrying said seat, a sleeve surrounding said stem and guided in said guide ring, a spring loaded locking member mounted on said sleeve and adapted to cooperate with said notches of said stem for securing the latter in adjusted positions, a flange on said sleeve, and a compression spring surrounding said sleeve and inserted between said flange and said guide ring for resiliently supporting said sleeve and thereby said stem and seat of the chair.

2. A revolving chair, comprising in combination, a pedestal, an upper guide ring fixed to said pedestal, a lower guide ring rigidly fixed to said pedestal, a seat, a stem provided with notches and carrying said seat and guided in said upper guide ring a 5 sleeve surrounding said stem and passing through said lower guide ring, a spring loaded locking member mounted on said sleeve b and adapted to cooperate with said notches i of said stem for securing the latter in adjusted positions, a flange on said sleeve and 10 a compression spring surrounding said sleeve and inserted between said flange and said lower guide ring for resiliently supporting said sleeve and thereby said stem and seat of the chair. 15 In testimony whereof, I have'signed my name to this specification.

' ALBERT STOLL. 

